Hi,

I need to write hwclock inside my c application.

I've tried the following code, but with no success:

struct rtc_time{

int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;/* unused */
int tm_yday;/* unused */
int tm_isdst;/* unused */

};

struct rtc_time rt;

// init the structure

int fd =open("/dev/rtc", O_RDONLY); // also O_RDWR doesn't work
rc =ioctl(fd,RTC_SET_TIME, &rt);
close(fd);

the ioctl returns -1 and the system time doesn't change!

Any hint?

Thanks

Hi,

thank you for your help.

I've tried the first sample you give me, but the date cannot be set.

The set of the clock return without error, the get of the clock returns the same date/time just set, but the system clock is not updated. The "date" command (on the console) returns the unmodified date and time, also the time() function returns the same time.

What I've to do?

Thanks

How did you retrieve the RTC state after setting it? Did you use some API, hwclock - or just date?